It was a fun learning experience! Check out the more detailed thread: Did a Big 3 UpgradeVery nice! How was the install? Any performance bumps? I keep putting it off but it's on my list.
So far it's a tossup regarding performance bump. I've only driven the car once since I did the upgrade, and I actually logged a lower average voltage!
I'm still getting great fuel economy and I really think my audio system sounds better.